Black substance leaking out from tea pet

its ok. its absorbed tea coming out. you can tilt piggy when drying out that tea wouldnt accumulate there

You’re fine unless its head starts rotating.

This could be a case of Clay Flu… while it’s rare, sometimes tea pets can get sick from the constant change of temperature. If this is a possibility you may want to submerge it into a nice hot bath of some freshly brewed tea.